ThrowsWith.hpp

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#pragma once
 
#include <gtest/gtest.h>
 
#include <functional>
#include <stdexcept>
#include <string>
 
namespace ppforest2::test {
 
  namespace {
    inline std::string expected_message(std::string const& needle, std::string const& what) {
      return "expected message containing \"" + needle + "\", got \"" + what + "\"";
    }
 
    inline std::string wrong_exception(std::string const& what) {
      return "wrong exception type: " + what;
    }
  }

  inline ::testing::AssertionResult throws_with(std::function<void()> const& fn, std::string const& needle) {
    try {
      fn();
    } catch (std::runtime_error const& e) {
      std::string const what = e.what();
      if (what.find(needle) != std::string::npos) {
        return ::testing::AssertionSuccess();
      } else {
        return ::testing::AssertionFailure() << expected_message(needle, what);
      }
    } catch (std::exception const& e) {
      return ::testing::AssertionFailure() << wrong_exception(e.what());
    }
    return ::testing::AssertionFailure() << "did not throw";
  }
}